*4205-366Y MINNESOTA RUBBER QUAD RING

This quad-ring is supplied in AS568-205 black Buna-N (Nitrile) 70 Shore A measuring an inside diameter of 0.421 in (10.69 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 0.699 in (17.75 mm), catalogued under part number HQ4205. It seats in a standard o-ring gland while offering improved dynamic performance.

The material holds up against water, greases and lubricants, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) delivers strong abrasion and tear resistance, reliable performance in both static and dynamic service. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It is not the right choice where automotive brake fluid or ozone and direct sunlight are present. The profile itself contributes two sealing bands per contact face rather than one and lower compressive load required to achieve a seal.

Common environments for this compound include general industrial maintenance, construction equipment, and automotive.

Reference part number HQ4205 when ordering; the item is sold individually. Check the compound against your process media, pressure and temperature before committing to a design.